Network Switch Standby Power Management via Layer-1 Signal Detection
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Solution Overview
Problem
Network devices, such as switches, face challenges in reducing energy consumption while maintaining operational readiness, as existing solutions like deep sleep modes do not effectively manage power usage and wake-up processes efficiently.
Innovation Solution
A method and device that monitor the loss of signal terminal to initiate a wake-up procedure, transitioning the network switch from a standby mode to an active mode by using power management processors to control the communication interface, allowing the CPU and communication interface to become operational only when a signal is detected, thereby reducing power consumption and enabling efficient wake-up mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If network switch is placed in deep sleep mode to reduce energy consumption, then power consumption is reduced to less than 6W, but the switch cannot respond to wake-up packets and remains non-operational
Solution Approach 1:
The network switch is divided into multiple operational components with different power states. The CPU and communication interface can be placed in sleep mode independently while the loss of signal terminal monitoring remains active. This segmentation allows the switch to consume less than 6W in standby mode while maintaining the ability to detect wake-up triggers through the monitored terminal, resolving the contradiction between low power consumption and operational readiness.
2Reliability
If network switch components remain operational to maintain operational readiness, then the switch can respond to wake-up packets, but energy consumption increases significantly
Solution Approach 1:
The system performs preliminary monitoring of the loss of signal terminal while in standby mode, before full operational mode is activated. This preliminary action allows the switch to detect wake-up triggers (such as link status changes) and only then activate the CPU and communication interface. This approach maintains operational readiness for essential events while minimizing power consumption during idle periods.
3Reliability
If magic packet wake-up mechanism is used, then the switch can be awakened from sleep mode, but the mechanism adds device complexity and does not fully utilize Layer-1 components
Solution Approach 1:
The patent replaces the Layer-3 magic packet wake-up mechanism with a Layer-1 based wake-up mechanism. Instead of relying on high-level protocol packets that require full protocol stack activation, the system uses physical layer signal detection through the loss of signal terminal. This substitution simplifies the wake-up mechanism by utilizing lower-level hardware capabilities that are already present in the physical interface, reducing the complexity required for wake-up functionality.
Data Source
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AI summary
A connectivity device, such as a switch may consume lesser power by transitioning into stand-by mode in response to a command from an upstream connectivity device, such as another switch. In the stand-by mode the switch may power down circuitry of the switch that handles incoming messages. The switch may be powered up from the stand-by mode by using a PHY or Layer-1 components of the switch.